Flavour separation of helicity distributions from deep inelastic muon-deuteron scattering

We present a LO evaluation of helicity densities of valence, Δ u_v + Δ d_v, non-strange sea, Δ over(u, ̄) + Δ over(d, ̄), and strange quarks, Δs (assumed to be equal to Δ over(s, ̄)). They have been obtained from the inclusive asymmetry A_{1, d} and the semi-inclusive asymmetries A_{1, d}^{π +}, A_{1, d}^{π -}, A_{1, d}^{K +}, A_{1, d}^{K -} measured in polarised deep inelastic muon-deuteron scattering. The full deuteron statistics of COMPASS (years 2002-2004 and 2006) has been used. The data cover the range Q² > 1   (GeV / c)² and 0.004 < x < 0.3. Both non-strange densities are found to be in a good agreement with previous measurements. The distribution of Δ s (x) is compatible with zero in the whole measured range, in contrast to the shape of the strange quark helicity distribution obtained in most LO and NLO QCD fits. The sensitivity of the values of Δ s (x) upon the choice of fragmentation functions used in the derivation is discussed.